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'''{{PAGENAME}}''' is a powerful [[Daemon]] of [[Chaos Undivided]] that took part in the [[Horus Heresy]].{{Fn|1a}}

Long preparations were made to summon Madail from the [[Warp]]{{Fn|1a}}, but they finally came to fruition when the [[Ruinstorm]] was cast during the Heresy and those stuck within it were unable to reliably use the [[Astronomicon]]{{Fn|1b}}. In the aftermath of the Ruinstorm's creation, the [[Xenos]] built [[Chaos]] structures on the [[Death World]] [[Pythos]], acted like a beacon within the [[Warp Storm]] and this drew the remnants of the [[Iron Hands]] [[Space Marine Legion|Legion's]] [[111th Clan-Company|111th Company]] and their [[Raven Guard]] and [[Salamanders]] allies to the world{{Fn|1c}}. Led by their [[Space Marine Captain|Captain]] [[Durun Atticus]], the Iron Hands and their allies landed upon the Death World and built a base, so that their [[Astropath]] [[Rhydia Erephren]] could study the structures in order to determine how they functioned{{Fn|1d}}. This was followed by the arrival of a fleet of ships{{Fn|1e}} filled with [[Chaos]] worshipers from [[Davin]]; who had been told by a messenger from the Warp, that they would play a key part in summoning Madail{{Fn|1a}}. Though the Davinites nearly met their ends at the jaws of Pythos' predators{{Fn|1e}}, they were saved by the Iron Hands after the Company was persuaded to come to their aid, by the Salamanders [[Space Marine Sergeant|Sergeant]] [[Khi'Dem]] and the Raven Guard Legionary [[Inachus Ptero]]. Not knowing the Davinites' true nature, the Iron Hands then allowed them to build a settlement near the Company's base, after the Davinites declared that Pythos was their new home and purposely destroyed the spaceships that brought them to the Death World.{{Fn|1f}}

Madail later reappeared leading a host of Daemons during the [[Siege of Terra]].{{Fn|3}}

*1: [[The Damnation of Pythos (Novel)]]

**{{Endn|1a}}: Chapter 18